Wikipedia
Al-Istibsar
Al-Istibsar (Al-Istibsar fi ma ukhtulif fihi min al-akhbar) ( Arabic: اَلاِْسْتِبْصار فیما اختلف من الأخبار) is a Hadith collection, by the famous Twelver Shia Hadith scholar Abu Jafar Muhammad Ibn Hassan Tusi, commonly known as Shaykh Tusi. This work is included among The Four Books of Shia Islam. It includes the same subjects as Tahdhib al-Ahkam but in a shorter form.